We’ve already started working on a new migration script feature for SQL Source Control. An early access build is already available and you can find out more about it here: http://documentation.red-gate.com/display/MV2We’re also planning to release a beta in the coming few weeks that will have this new feature integrated in SQL Compare and Deployment Manager for dynamic upgrades.
The work for static upgrades that supports migrations will not be available until late November at the earliest.